James h



(No Model.)

J. H. SEWALL.

STEAM'TRAP. No. 863,552.

Patented May 24, 1887.

UNITED STATES PATENT OFFICE.

JAMES H. SEWALL, OF PORTLAND, MAINE, ASSlGNOR TO THE SEVALL SAFETY OAR4HEATING COMPANY, OF SAME PLACE.

STEAM-TRAP.

SPBQIFICATION forming part o Letters Patent No. 363,552, dated May 24,1887. Application filed September 14, 1886. Serial No. 213,515. (Nomodel.)

To aZZ whom it may concern: with a cylindrical opening or chamber,c,into 1 Be it known that I, JAMES H. SEWALT., of which is placed and inwhich slides apiston. Portland, county of Gumberland,and State of Theinlet-passage a communicates with the Maine, have invented anImprovement in valve-chamber o. v 5 Steam-Traps, of which the followingdescrip- The piston, as herein shown, is composed of 55 tion, inconnectionwith the accompanying l two disks, d d', joined together by atubular drawings, is a specification, like letters on the stern, 2, arod, di, having a head, 2, being drawings representing like parts.passed longitudinally through the piston and This invention has for itsobject to improve a cap at one end thereof, the said rod being l 1o thatclass of steam-traps employing thermo- Vretained in the piston andholding the cap in 6o static devices for controlling the discharge ofplace by a nut screwed upon one end thereof. water of condensation. Y(See Fig. 1.) The head 2 has ears 3. The open- Theinvention consists ofa shell or casehav ing or chamber c',at a point between the Vtwo ingsuitable inlet and outlet passages,through disks of the piston, isprovided with an outlet which the water of condensation and steam ordischarge passage, ci, so that water of con- 65 pass, and a thermostaticdevice sensitive to densation and steam passing through the inlet-`variations in temperature contained within passage a and around the stemd2 ofthe piston the said shell or case, combined with a sliding isdischarged through the outlet c4t when the piston for opening andclosing the inlet-pasl piston is in its rearward position, as shown in2o sages, and means, substantially as' will be de- Fig. 1. 7o

scribed, operated positively by the thermo- The thermostatic device,herein shown as a stat-ic device for moving the piston back and sealedvessel, V, secured to the frame c below forth.

, the chambered portion e', and filled'with any My improved trapconsists, essentially, of a suitable expansive material,has at itsexpanv2 5 shellhavlng at one enda removablehead-piece, sible face an earor projection, 14:.

which at its inner side supports a frame, pro- The lower end of theframe c is provided vided with acylindrical opening for the recepwith anarm, c5, secured thereto, to the end of tion of apiston connected to alever pivoted which, at 15, is pivoted the outer operating-leupon aprojection at the inner end ofthe said ver, L,which,extended vertically,is connected frame, the said lever being actuated more or to the ear 14,and so as to be actuated by the 8O less by a thermostatic deviceconsisting, as thermostatic device, the upper end of the said hereinshown, of a sealed vessel supported operating-lever being looselyconnected with within the frame, one part of the said vessel the pistonby apin,16, passing through the end being jointed to the said lever andoperating of the said operating-lever L and the ear 3.

to move the piston, as will be described. When the temperature issufficiently low, 85

Figure 1 shows in vertical section a steamthe thermostatic vessel iscollapsed, as shown trap embodying this invention; Fig. 2, a side inFig. 1, leaving the piston to allow water of elevation ofthe head-pieceand the operating condensation and steam to be discharged freely, partsof the steam-trap attached thereto rebut when steam enters the shell orcase the 4o moved from the shell or case, and Fig. 3 a top vessel V isexpanded to move the operating- 9o view ofthe steam-trap. lever L, andwith it the piston, until the disk d The main shell or case A of thetrap receives thereof closes the discharge passage or orifice in one endof it the head-piece B,the said parts c4, thus cutting off the steam aswell as the being screwed together. The head-piece is water ofcondensation. The steam being thus provided with an inlet, a, and theshell with cut ofi', the thermostatic device gradually col- 9 5 anoutlet-passage, b,forthe admission'and disi lapses until the disk dopens the discharge charge of water of condensation and steam. port ororifice c* and allows the passage of The head-piece has secured to itsinner side a water of condensation and steam. frame, c, which enters theshell or case, the The steam-trap herein shown is especially 5o saidframe near the head-piece being provided applicable forautomaticallyemptying resern 10o shall freeze. moved to open the inletin low temperature I claim` and to close thenletin high temperature,sub- 1. In a steam-trap, the shell or case having stantially asdescribed. lo suitable inlets and outlets, the frame c, placed 3. In asteam-trap, the shell or case oom- 35 within the shell or case, saidframe having an posed of the shell A and cover B, having a 15 in thesaid opening at the upper end ofthe anda thermostatic device for movingthe 4o frame c, the lever for moving said piston, and lever, allsupported by the cover B, so that the thermostatio device, sensitive tochanges the device may be readily put together and in thetemperatnre,f0r moving the lever to taken apart, all substantially asdescribed. close the inlet during high temperatures only, Intestimonywhereof Ihave signed my name zo substantially as described. tothis specification in the presence of two 45 2. In a steam-trap, theshell or case having I subseribil'ig Witnesses. a suitable inlet andoutlet passage, the frame JAMES H. SEWALL. c, placed Within the shell orcase. said frame f Witnesses: having an opening at its upper end incommn- DANIEL D. SEWALL, 25 nieation both with the inlet and also withthe CHAs. B. STROUT,

